Final answer:
The claim that something can have momentum without having inertia is false; momentum is a product of mass and velocity, both of which are directly related to inertia.
Step-by-step explanation:
Momentum is a product of mass and velocity, meaning it cannot exist without inertia since inertia is directly related to an object's mass. As defined by Newton's first law of motion, inertia is the tendency of an object to resist changes in its state of motion, which directly ties to its mass. Every object with mass has inertia, and thus an object in motion, which has mass and velocity, has both inertia and momentum. It's important to highlight that momentum is conserved only if all external forces are balanced, meaning the net external force is zero. In a system where there is a net external force (like friction in the car example), the conservation of momentum appears to be violated. However, if we were to consider a larger system that includes external forces, momentum would be conserved within that larger system.